Originally Posted by
greenpea
Nice! Keep us updated I have 4000s right now thinking about upgrade to 5000s
I have a GP5 on the rear wheel and a GP4 on the front wheel, I don't think you need to "upgrade" since the differences are literally imperceptible but if you have to replace your GP4s anyway, might as well spend a few extra bucks per tire for newer technology.
Here's an interesting comparison-
https://www.bicyclerollingresistance...prix-5000-2018
TL;DR- The GP5000 has slightly better rolling resistance, slightly worse puncture protection, and slightly higher weight (at least for the units sampled, the claimed weight by Conti is lower for the GP5). They're both great tires.